package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter{
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //1.拦截所有请求 放行一些必要的资源
        //2.判断本次请求, 是否需要登录, 才可以访问
        //3.如果不需要，则直接放行
        //4.判断登录状态，如果已登录，则直接放行
        //5.如果未登录, 则返回未登录结果

        //1.定义放行的资源
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //2.获得本次请求路径
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();

        log.info("拦截的请求：{}",requestURI);

        //3.判断本次请求是否需要登录才可以访问
        //3.1 如果不需要处理 则直接放行
        boolean check = check(urls,requestURI);

        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

    /*    //3.2 判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute(("employee") )!= null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }*/
        //4.判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee")!=null  || request.getSession().getAttribute("user")!=null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("employee"));
            //设置值
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }

        //3.3 如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));


    }

    public boolean check(String[] urls,String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }


}
